Voltage Management Articles
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Voltage stabilisation of SMES VSI DC-link and compensation of reactive power by SMES using optimised switching strategies
This paper presents a novel and optimised switching strategy and control approach for a three-level two-quadrant chopper in a three-level neutral point clamped (NPC) voltage source inverter (VSI) superconducting magnetic energy storage (SMES). Using the proposed switching strategy, the voltage of the inverter capacitors in SMES can be independently controlled. Also, the minimum power and ...
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Voltage Optimisation can improve schools energy efficiency by up to 25%
Voltage Optimisation is a key component in any energy efficiency programme and could deliver up to 25% savings on electricity bills. In April the registration period for the Carbon Reduction Commitment (CRC) Energy Efficiency Scheme will start again. Local authorities and companies with a portfolio of private schools will face sizeable fines unless they account for their energy use and make ...
By Vital Energi
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A self-tuning optimised unscented Kalman filter for voltage flicker and harmonic estimation
This paper presents a novel technique for estimation of two important power quality problems like voltage flicker and harmonics in power networks using an unscented Kalman filter (UKF) algorithm. The fluctuating voltage of a power network resulting in voltage flicker is tracked for estimating its envelope, voltage magnitude, and frequency. Further, the unscented filter is used to estimate ...
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Comparative control analysis of the Vienna rectifier based on its averaged model
This paper presents a comparative evaluation of two multiple-loops duty-cycle-based control schemes applied to a three-phase three-switch three-level boost-type rectifier. The control laws are both elaborated on the basis of a state-space averaged model of the converter, expressed in the synchronous rotating frame. On the one hand, a control scheme that uses linear regulators is designed by using ...
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A novel particle swarm optimisation self-regulating stand-alone wave energy conversion scheme
The paper presents a novel stabilisation scheme system for a wave energy converter (WEC) using permanent magnet linear generator (PMLG) connected to a six-pulse diode rectifier. The proposed controller of WEC-battery renewable energy system is based on multi-objective particle swarm optimisation (MOPSO) technique. The optimisation algorithm is implemented to control a novel low cost dynamic AC ...
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Non-isolated single stage PFC rectifier for wide-input large step-down voltage applications
This paper proposes a non-isolated single-stage high power factor rectifier suitable for applications requiring low-voltage and high-current output. The proposed converter integrates two buck-boost converters with a buck converter. As a result, the proposed converter can operate over a wide range of input voltage with extended low output voltage capability, making it suitable for universal input ...
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Variable Speed Drives as a key step to cutting energy use ahead of the CRC
Among several energy saving initiatives, Variable Speed Drives can help manufacturing to achieve 60% of immediate energy saving, reports Envido. Recently there has been an influx of regulations applied to manufacturing industry that has a major impact on energy use. Among them the CRC Energy Efficiency Scheme will apply mandatory emissions trading to cut carbon emissions from large non-intensive ...
By Vital Energi
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Voltage Optimisation Technology proven capacity to save energy
Voltage Optimisation, can save British companies an average of 13% in electricity consumption and carbon emissions, reports ...
By Vital Energi
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Voltage optimisation – improving energy efficiency and reducing carbon
The CRC Energy Efficiency Scheme will affect around 5,000 large businesses and public sector organisations that consume over 6,000 MW hours of electricity. A failure to reduce energy consumption and carbon emissions will result in financial and reputational ...
By Vital Energi
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Save money, save carbon
As a way of saving money in a financially difficult time, engaging in a resource efficiency programme can help organsations cut costs from waste, water, packaging, emissions and supply chain wastage. Embedding a resource efficient approach to procurement business can proactively work with suppliers that offer cost effective solutions as well as environmentally preferable options. In the UK there ...
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Development of modulation strategies for three-phase to two-phase matrix converters
In this paper, the modulation strategy is developed for three-phase to two-phase matrix converters for synthesising balanced and unbalanced output voltages from balanced and unbalanced input voltages. Reduction of low order input current harmonics with sinusoidal output voltages is achieved by using the proposed switching strategies. The other advantage of the proposed method is the significant ...
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Reactive and real power compensation with DSTATCOM and BESS for mitigation of flicker
Voltage flicker, a phenomenon of annoying light intensity fluctuation, caused by rapid change in industrial and domestic load such as electric arc furnaces (EAF), rolling mills, welding equipments and pumps operating periodically, has been a major concern for supply utilities, electricity regulatory agencies and costumers. The FACTS devices like SVC's, STATCOM and custom power devices like ...
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Optimal integration of distributed generations for profit maximisation and voltage improvement including voltage rise issue
The integration of distributed generation (DG) at the load centres with the grid is a challenging task. This paper deals with the best location of DG as well as a proper share of loads between DG and grid that will yield the most economically efficient results. The optimal allocation of DG in distribution network is very common with an objective to minimise the losses. Loss minimisation is a good ...
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Why the fossil-fuelled reactor fleet in France will not be affected by an evolution of the wind power capacity
Today's power electronics can confer high-performance adjustment capabilities on any technological object, including the frequency-power and voltage tuning of modern, synchronous-type wind turbines. However, this will not enable such devices to steadily produce electric power from an uncontrolled mechanical energy. Thus they cannot be considered independent generation units: the need to ...
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Behaviour of Microbial Fuel Cell in a start-up phase
A Single-Chamber Microbial Fuel Cell (SCMFC) was constructed and run in a sequential feed-and-draw cycle operation. Anaerobic mixed bacterial culture and wastewater obtained from a local municipal wastewater treatment plant were used as biocatalysts and media, respectively. The SCMFC behaviour in a start-up phase was examined using the electrical potential (voltage) profiles, and further ...
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Study, modelling and control of a single-phase power factor corrector based on the Sheppard-Taylor topology
In this paper, a single-phase power factor corrector (PFC) based on the Sheppard-Taylor topology is studied. A novel mathematical representation of the converter is elaborated using the state-space averaging technique. In order to emphasise the usefulness of such model, three pulse-width-modulated (PWM) multi-loops control schemes are proposed and developed in the aim of ensuring a unity power ...
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A combined multipulse-multilevel inverter based STATCOM for improving the voltage profile and transient stability of power system
In this paper, a new combined multipulse-multilevel inverter topology is proposed for static synchronous compensator to regulate AC supply voltage at a constant level. A detailed analysis of the operating characteristics of the various inverter topologies in respect of total harmonic distortion (THD) and device count are compared in the paper. A closed loop decoupled control strategy for ...
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Distribution system insulator monitoring using video surveillance and support vector machines for complex background images
Development of substation monitoring system (SMS) with improved features for substation automation purposes has become one of the potential areas of research particularly in developing countries like India. The unending SMS automation systems usually incorporate protection of the distribution system from different faults based on monitoring of parameters, such as voltage, current and so forth. ...
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Instantaneous voltage measurement technique for PWM voltage source inverters
The pulse width modulated (PWM) voltage source inverter (VSI) is almost universally used in industrial motor drives. Although measurement of the VSI output voltage is required in many applications, accurate measurement is problematic due to the high frequency inverter switching. Many commonly used inverter output voltage measurement methods, such as indirect and direct voltage measurement, ...
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The CBR-PNN approach to real-time voltage security assessment of power systems
This paper presents the Case-based Reasoning (CBR) technique, a novel approach to voltage security assessment of power system in a real-time environment. The Probabilistic Neural Network (PNN) is used for determining the solution to a new case, using the old cases from the case base of the CBR system. A feature selection technique based on the information gained has been employed to identify the ...
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